i think as long as the files that are owned by bladmin stay owned by bladmin you're ok. so shutdown everything, change the uid and then change the perms on all files w/ that old uid.
The issue in your case Todd has to do with the file server setup.
If your file server is NFS mounted to multiple appservers and you don't map your fileserver agent to root with root squash disabled. You will have ownership issues between the boxes when connecting to the share.
As long as the bladmin UID is consistent across all appservers that share a NFS mounted datastore, and the datastore ownerships are set to the correct UID all should be well.